A sealing structure of a movable threshold of a civil air defense door and a sealing forming method thereof

Abstract

This invention discloses a sealing structure for a movable threshold of a civil defense door, comprising a door body and a movable threshold. The movable threshold is pre-embedded in the ground at the closed position of the door body. An inner groove is formed at the bottom of the door body. The movable threshold is movably installed by lifting. When the movable threshold rises, it fits into the inner groove. An expansion sealing sleeve is fixedly installed at the bottom of the inner groove. After the expansion sealing sleeve is filled and expanded, it forms a sealing wall structure at the top of the movable threshold. This invention designs an inner groove at the bottom of the door body to accommodate the upward insertion of the movable threshold. The invention installs an expansion sealing sleeve at the bottom of the inner groove. In wartime, the expansion sealing sleeve is filled with sand to create an expansion effect. Under the action of compaction, the expansion sealing sleeve fits into the sealing groove at the top of the movable threshold to form a tightly fitting sealing wall structure, thereby meeting the reliable sealing requirements of the movable threshold connection position.

Description

Technical Field

[0001] This invention relates to the field of civil defense equipment technology, and more specifically, to a sealing structure for a movable threshold of a civil defense door and a method for forming that seal. Background Technology

[0002] Civil defense doors are specialized protective facilities at the entrances and exits of civil air defense projects. They are mainly used to prevent air raids and disasters. In peacetime, they are used as ordinary doors, but in wartime, they can protect against shock waves, toxic fumes, and toxic agents. Civil defense doors are commonly used in underground shopping malls, underground parking lots, and other similar locations. Their core functions are protection and airtightness.

[0003] The lift-type sliding threshold is an important component of air defense door equipment. Under normal circumstances, the threshold is lowered and flush with the ground to facilitate the entry and exit of personnel and vehicles. In wartime, the threshold rises to seal the bottom edge of the air defense door, ensuring a tight seal. For air defense door equipment, the contact point between the bottom of the door and the sliding threshold is a key challenge in the design of airtight protection. The purpose of this application is to design a reliable and airtight sealing structure. Summary of the Invention

[0004] The purpose of this invention is to address the needs of the prior art by providing a sealing structure and sealing method for a fire-resistant door threshold. This invention designs an inner groove at the bottom of the door to accommodate the upward insertion of the threshold. An expansion sealing sleeve is installed at the bottom of the inner groove. During wartime, sand is filled into the expansion sealing sleeve to create an expansion effect. Under compaction, the expansion sealing sleeve fits into the sealing groove at the top of the threshold to form a tightly fitting sealing wall structure, thereby meeting the reliable sealing requirements of the threshold connection point.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A sealing structure for a movable threshold of a civil defense door includes a civil defense door body and a movable threshold. The movable threshold is pre-embedded in the ground at the closed position of the civil defense door body. An inner groove is provided at the bottom of the civil defense door body. The movable threshold is movably installed by lifting. When the movable threshold rises, it is adapted to fit into the inner groove. An expansion sealing sleeve is fixedly installed at the bottom of the inner groove. After the expansion sealing sleeve is filled and expanded, it forms a sealing wall structure at the top of the movable threshold.

[0007] Furthermore, the air-raid shelter door has a sand chamber filled with dry fine sand. Several sand-filling holes are provided on the partition plate between the sand chamber and the inner groove. The expansion sealing sleeve is connected to the sand chamber through the sand-filling holes. By opening the sand-filling holes, the dry fine sand in the sand chamber flows into the expansion sealing sleeve to form a filling and expansion effect.

[0008] Furthermore, the sand filling hole is a conical hole, and a sealing plug is installed in the sand filling hole. The outer wall of the sealing plug is adapted to the shape of the sand filling hole. The sealing plug is installed in a lifting and lowering motion, and the sealing plug seals the sand filling hole from bottom to top.

[0009] Furthermore, a recessed sealing groove is formed at the top of the movable threshold, and the expansion sealing sleeve is made of thin-walled rubber. The expansion sealing sleeve hangs down and is inserted into the sealing groove. The expansion sealing sleeve expands by filling sand, so that the expansion sealing sleeve forms a wall that matches the shape of the sealing groove.

[0010] Furthermore, the sand bin is equipped with a control mechanism, which includes a lifting plate. The lifting plate is vertically installed inside the sand bin and is connected to the sealing plug to control the opening and closing of the sand filling hole.

[0011] Furthermore, a pull rope is installed between the lifting plate and the sealing plug.

[0012] Furthermore, the air-raid shelter door has an operating room and a passageway. The passageway is vertically oriented, with its upper end connected to the operating room and its lower end connected to the sand silo. The operating mechanism also includes a lifting drive mechanism. A vertical column is fixedly connected to the center of the lifting plate. The lifting drive mechanism is installed in the operating room and the passageway, and is driven by the vertical column.

[0013] Furthermore, the lifting drive mechanism includes a threaded seat and a drive screw. The threaded seat is fixedly installed on the top of the channel groove. The drive screw is vertical and threadedly connected to the threaded seat. The bottom of the drive screw is rotatably connected to the top of the straight column. The top of the drive screw extends into the control chamber. A drive head with a polygonal cross-section is fixedly connected to the top of the drive screw. A guide seat is fixedly connected to the outer wall of the straight column. The channel groove has a square cross-section, and the guide seat is adapted to the channel groove for installation.

[0014] A method for forming a seal on the threshold of a civil defense door, which utilizes a sealing structure for the threshold, includes the following steps:

[0015] S1: Rotate the air-raid shelter door to the closed position;

[0016] S2: Raise the movable threshold and insert it into the bottom groove of the air-raid shelter door.

[0017] S3: The movable door sill is raised to the position, and the loosened expansion sealing sleeve is inserted into the sealing groove at the top of the movable door sill.

[0018] S4: Open the control room to operate the lifting drive mechanism. First, the sand bin is opened to release sand. Dry fine sand flows in and fills the expansion sealing sleeve to form an initial expansion. Then, as the lifting plate continues to press down, the dry fine sand is compressed. The expansion sealing sleeve continues to expand to fit the sealing groove until the dry fine sand is completely compacted and forms a wall structure in the sealing groove.

[0019] In summary, the present invention has the following beneficial effects:

[0020] This invention features an inner groove at the bottom of the door to accommodate the upward insertion of the movable threshold. An expansion sealing sleeve is installed at the bottom of the inner groove. In wartime, sand is filled into the expansion sealing sleeve to create an expansion effect. Under compaction, the expansion sealing sleeve fits into the sealing groove at the top of the movable threshold to form a tightly fitting sealing wall structure, thereby meeting the reliable sealing requirements of the movable threshold connection position. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the sealing structure of a movable threshold of a civil defense door according to this embodiment;

[0022] Figure 2 This is a schematic diagram of the expansion sealing sleeve in this embodiment when it is not filled;

[0023] Figure 3 This is a schematic diagram of the expansion sealing sleeve in this embodiment when filling to form a sealing wall structure;

[0024] Figure 4 This is a schematic diagram of the installation structure of the control mechanism in this embodiment.

[0025] Figure label:

[0026] 1. Air defense door body, 11. Inner groove, 111. Sand filling hole, 12. Expansion sealing sleeve, 13. Sand chamber, 14. Sealing plug, 15. Control room, 16. Passage groove, 2. Movable threshold, 21. Sealing groove, 3. Control mechanism, 31. Lifting plate, 32. Pull rope, 33. Straight column, 331. Guide limit seat, 34. Lifting drive mechanism, 341. Threaded seat, 342. Drive screw, 343. Drive head. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1 to 4As shown, this embodiment discloses a sealing structure for a movable threshold of a civil defense door, including a civil defense door body 1 and a movable threshold 2. The movable threshold 2 is pre-embedded in the ground at the closed position of the civil defense door body 1. The movable threshold 2 has a vertical lifting function. Normally, the movable threshold 2 is lowered to be flush with the ground to facilitate the entry and exit of vehicles and personnel. In wartime, it is raised to seal the bottom of the civil defense door body 1. The lifting movable threshold 2 is a conventional product of civil defense door equipment, and it is generally raised and lowered by hydraulic or mechanical means. Its lifting drive structure will not be described in detail here. This invention provides an inner groove 11 at the bottom of the civil defense door body 1. The movable threshold 2 is raised and fitted into the inner groove 11. This invention designs an expansion sealing sleeve 12 fixedly installed at the bottom of the inner groove 11. The expansion sealing sleeve 12 is made of thin-walled rubber material, with the edges bonded with high-strength adhesive, and the middle is a cavity for... The invention uses filling material to expand and inflate the door. A recessed sealing groove 21 is formed at the top of the movable door sill 2. The expansion sealing sleeve 12 is normally in a relaxed and drooping state, covering the bottom of the inner groove 11. After the movable door sill 2 rises, the edge of the expansion sealing sleeve 12 is pressed by the rising movable door sill 2, and the relaxed and drooping part of the expansion sealing sleeve 12 is inserted into the sealing groove 21. Then, by controlling the filling and expansion of the expansion sealing sleeve 12, the expansion sealing sleeve 12 forms a wall that fits the shape of the sealing groove 21. The filling material acts as a skeleton, and the expansion sealing sleeve 12 is in close contact with the groove wall of the sealing groove 21 to form a seal. This wall structure is the movable door sill sealing structure used by the invention to reliably seal the bottom of the air-raid shelter door. The invention not only solves the sealing difficulty at the bottom of the air-raid shelter door, but the inserted movable door sill 2 also enhances the overall impact resistance of the air-raid shelter door.

[0029] The material used to fill the expansion sealing sleeve 12 in this invention is designed to be dry fine sand, such as... Figures 1-3 As shown, the air-raid shelter door 1 has a sand chamber 13, which is filled with dry fine sand (the dry fine sand can be pre-filled; if pre-filled for a long period, the drying problem must be considered, and heating and drying operations must be carried out regularly; the dry fine sand can also be filled during wartime, in which case the sand must be dry and have good fluidity). The sand chamber 13 is separated from the inner groove 11 by a partition plate. Several sand filling holes 111 are opened on the partition plate between the sand chamber 13 and the inner groove 11. The internal relaxation space of the expansion sealing sleeve 12 is connected to the sand chamber 13 through the sand filling holes 111. By opening the sand filling holes 111, the dry fine sand in the sand chamber 13 flows into the expansion sealing sleeve 12 to form a filling and expansion effect.

[0030] like Figure 2 and Figure 3 As shown, the sand filling hole 111 of this invention is designed as a conical hole, and a sealing plug 14 is installed in conjunction with the sand filling hole 111. The outer wall of the sealing plug 14 is adapted to the shape of the hole of the sand filling hole 111 to form a conical sealing effect. The sealing plug 14 is installed in a lifting and lowering motion, and the opening and closing control of the sand filling hole 111 is formed by driving the lifting and lowering movement of the sealing plug 14.

[0031] like Figure 1 and Figure 4 As shown, the present invention provides a control mechanism 3 for the sand bin 13. The control mechanism 3 includes a lifting plate 31, which is vertically installed inside the sand bin 13. The lifting plate 31 is connected to the sealing plug 14 for transmission, thereby controlling the opening and closing of the sand filling hole 111. The descent of the lifting plate 31 also creates downward pressure on the dry sand, thereby squeezing the dry sand into the expansion sealing sleeve 12 to form a compacted wall effect. During the sealing process, the lifting plate 31 needs to continuously descend. To coordinate with the descent of the lifting plate 31, the present invention cleverly designs the sealing plug 14 to seal the sand filling hole 111 from bottom to top. First, the sealing plug 14 is located on the bottom outside of the sand bin 13. The rising of the sealing plug 14 closes the sand filling hole 111, while the descending of the sealing plug opens the sand filling hole 111. This perfectly matches the descent of the lifting plate 31. After descending, the sealing plug 14 descends, opening the sand filling hole 111, which perfectly meets the requirement of filling dry sand into the expansion sealing sleeve 12. The lifting plate 31 rises and resets, indicating that it needs to be in a sand storage state. At this time, it drives the sealing plug 14 to rise and block the sand filling hole 111. Before filling the sand bin 13 with dry sand, the sand filling hole 111 must be closed first. After the sealing plug 14 descends, in order not to affect the continued descent of the lifting plate 31, the present invention designs the connection between the lifting plate 31 and the sealing plug 14 as a flexible connection. A pull rope 32 is installed between the lifting plate 31 and the sealing plug 14. The pull rope 32 is a high-strength rope. The design of the pull rope 32 allows the sealing plug 14 to fall to its limit without affecting the continued descent of the lifting plate 31. After the lifting plate 31 rises, the sealing plug 14 can be kept in a closed state of the sand filling hole 111 by tightening the pull rope 32.

[0032] In order to operate the lifting plate 31, such as Figure 1 and Figure 4As shown, the present invention provides an operating room 15 and a passageway 16 for the civil defense door body 1. The passageway 16 is vertically opened, with its upper end connected to the operating room 15 and its lower end connected to the sand silo 13. The operating mechanism 3 also includes a lifting drive mechanism 34. A straight column 33 is vertically fixedly connected to the center of the lifting plate 31. The lifting drive mechanism 34 is installed in the operating room 15 and the passageway 16. The lifting drive mechanism 34 is driven by the straight column 33, and the connection position is set in the passageway 16. The lifting drive mechanism 34 includes a threaded seat 341 and a drive screw 342. The threaded seat 341 is fixedly installed in the passageway 16. Mounted on the top of the channel slot 16, the drive screw 342 is vertical and threadedly connected to the threaded seat 341. The bottom of the drive screw 342 is rotatably connected to the top of the straight column 33. This ensures that the rotation of the drive screw 342 can only create a lifting and lowering motion effect on the straight column 33 (the connection structure consists of a seat with an inner groove installed on the top of the straight column 33, with the bottom of the drive screw 342 limited and inserted into this seat. The bottom of the drive screw 342 can only rotate within the seat and cannot move up and down, thus, when the drive screw 342 rotates, it connects and drives the straight column 33 and the lifting plate 31 to move up and down). The top of the drive screw 342 extends into the control room 15. A polygonal cross-section drive head 343 is fixedly connected to the top of the drive screw 342. The polygonal cross-section drive head 343 is for easy use of tools such as wrenches to turn the drive screw 342. A guide limit seat 331 is fixedly connected to the outer wall of the straight column 33. The channel groove 16 has a square cross-section. The guide limit seat 331 is adapted to the channel groove 16 for installation. The guide limit seat 331 restricts the rotation of the straight column 33 and guides the vertical lifting movement of the straight column 33 and the lifting plate 31. Before filling the sand bin 13 with dry sand, it is necessary to operate the lifting plate 31 to rise. The taut straight rope 32 is used to keep the sealing plug 14 closed in the sand filling hole 111. During civil defense operations, the lifting plate 31 is lowered, the rope 32 is naturally relaxed, and it falls under the gravity of the dry sand, forming a conductive effect in the sand filling hole 111. The dry sand enters the expansion sealing sleeve 12 and is pressed down by the lifting plate 31 to expand the expansion sealing sleeve 12 into a sealed wall structure. In this invention, the control room 15 and the channel groove 16 are enclosed by plates to prevent accidental operation during normal operation. The control room 15 uses a detachable panel for easy operation during civil defense operations.

[0033] A method for forming a seal on the movable threshold of a civil defense door, which utilizes a sealing structure for the movable threshold of a civil defense door, includes the following steps:

[0034] S1: Rotate the air defense door 1 to the closed position;

[0035] S2: Raise the movable threshold 2 and insert it into the bottom groove 11 of the air defense door body 1;

[0036] S3: The movable sill 2 is raised into place, and the loosened expansion sealing sleeve 12 is just inserted into the sealing groove 21 at the top of the movable sill 2;

[0037] S4: Open the control room 15 to operate the lifting drive mechanism 34. Use a wrench to turn the drive screw 342 to first create the effect of the lifting plate 31 moving downward. As the lifting plate 31 moves downward, the sealing plug 14 opens the sand filling hole 111 to release sand from the sand chamber 13. Dry fine sand flows in and fills the expansion sealing sleeve 12 to form an initial expansion. Then, as the lifting plate 31 continues to press down, the dry fine sand is compressed. The expansion sealing sleeve 12 continues to expand to fit the sealing groove 21 until the dry fine sand is completely compacted and forms a wall structure in the sealing groove 21.

[0038] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A sealing structure for a movable threshold of a civil defense door, characterized in that, The device includes a civil defense door body (1) and a movable threshold (2). The movable threshold (2) is pre-embedded in the ground at the closing position of the civil defense door body (1). The bottom of the civil defense door body (1) is provided with an inner groove (11). The movable threshold (2) is installed in a lifting and lowering manner. The movable threshold (2) is raised and fitted into the inner groove (11). An expansion sealing sleeve (12) is fixedly installed at the bottom of the inner groove (11). After the expansion sealing sleeve (12) is filled and expanded, it forms a sealing wall structure on the top of the movable threshold (2).

2. The sealing structure of the movable threshold of a civil defense door according to claim 1, characterized in that, The door body (1) of the air defense door is provided with a sand chamber (13), which is filled with dry fine sand. Several sand filling holes (111) are provided on the partition plate between the sand chamber (13) and the inner groove (11). The expansion sealing sleeve (12) is connected to the sand chamber (13) through the sand filling holes (111). By opening the sand filling holes (111), the dry fine sand in the sand chamber (13) flows into the expansion sealing sleeve (12) to form a filling and expansion effect.

3. The sealing structure of the movable threshold of a civil defense door according to claim 2, characterized in that, The sand filling hole (111) is a conical hole. The sand filling hole (111) is fitted with a sealing plug (14). The outer wall of the sealing plug (14) is adapted to the shape of the hole of the sand filling hole (111). The sealing plug (14) is installed in a lifting and lowering motion. The sealing plug (14) seals the sand filling hole (111) from bottom to top.

4. The sealing structure of the movable threshold of a civil defense door according to claim 2, characterized in that, The top of the movable threshold (2) forms a recessed sealing groove (21). The expansion sealing sleeve (12) is made of thin-walled rubber. The expansion sealing sleeve (12) hangs down and is inserted into the sealing groove (21). The expansion sealing sleeve (12) expands by filling sand, so that the expansion sealing sleeve (12) forms a wall that matches the shape of the sealing groove (21).

5. The sealing structure of the movable threshold of a civil defense door according to claim 3, characterized in that, The sand bin (13) is equipped with a control mechanism (3), which includes a lifting plate (31). The lifting plate (31) is vertically lifted and installed inside the sand bin (13). The lifting plate (31) is connected to the sealing plug (14) to control the opening and closing of the sand filling hole (111).

6. The sealing structure of the movable threshold of a civil defense door according to claim 5, characterized in that, A pull rope (32) is installed between the lifting plate (31) and the sealing plug (14).

7. The sealing structure of the movable threshold of a civil defense door according to claim 5, characterized in that, The air defense door (1) has an operating room (15) and a passageway (16). The passageway (16) is vertically opened. The upper end of the passageway (16) is connected to the operating room (15), and the lower end is connected to the sand silo (13). The operating mechanism (3) also includes a lifting drive mechanism (34). A straight column (33) is vertically fixedly connected to the center of the lifting plate (31). The lifting drive mechanism (34) is installed in the operating room (15) and the passageway (16). The lifting drive mechanism (34) is connected to the straight column (33) for transmission.

8. The sealing structure of the movable threshold of a civil defense door according to claim 7, characterized in that, The lifting drive mechanism (34) includes a threaded seat (341) and a drive screw (342). The threaded seat (341) is fixedly installed on the top of the channel groove (16). The drive screw (342) is vertical and threadedly connected to the threaded seat (341). The bottom of the drive screw (342) is rotatably connected to the top of the straight column (33). The top of the drive screw (342) extends into the control room (15). A drive head (343) with a polygonal cross section is fixedly connected to the top of the drive screw (342). A guide seat (331) is fixedly connected to the outer wall of the straight column (33). The channel groove (16) has a square cross section. The guide seat (331) is adapted to the channel groove (16) for installation.

9. A method for forming a seal on a fire-resistant door threshold, implemented using a sealing structure for a fire-resistant door threshold as described in any one of claims 1-8, characterized in that, Includes the following steps: S1: Rotate the air defense door (1) to the closed position; S2: Raise the movable threshold (2) and insert the movable threshold (2) into the bottom groove (11) of the air defense door body (1). S3: The movable sill (2) is raised into place, and the relaxed expansion sealing sleeve (12) is inserted into the sealing groove (21) at the top of the movable sill (2). S4: Open the control room (15) to operate the lifting drive mechanism (34), first form the sand storage effect of the sand bin (13), dry fine sand flows in and fills the expansion sealing sleeve (12) to form initial expansion, then as the lifting plate (31) continues to press down to make the dry fine sand pressurized, the expansion sealing sleeve (12) continues to expand to fit the sealing groove (21) until the dry fine sand is completely compacted and forms a wall structure in the sealing groove (21).

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